Pneumatic cut-out device



C. C. FARMER. PNEUMATIC CUT-OUT DEVICE.

APPLICATION FILED AueJ. 1920.

1,424,001 Y. Patented July 25, 1922.

NWN/KIN I M .....L mmm.

lma INVENTOR CLYDE C. FARMER ATTORNEY comprises an electricpowercontroller 1 Unirse STATE sP'A'rari'r orifice.,

HOUSE AIR :BRAKEfc:oifrr=iii\iv, yor EWILMERDING,-ritnNsYLvANrAjwcoRPo'RA'. j"

Application inea August?, 1920. serial No. 401,896.

tioularly to a safety power cut-out device.

ln the operation of` electric traction cars, thevpower is occasionallylost by the'trolle)7 wheel leaving the trolley lwire or otherwise, andin such cases, the operator will apply thebrakes to bring the that hecanget oil the car "to replace the trolley wheel on the wire,'but he mayneg`- lect to return the controller whandle to oil' as the trolleywheellias been replaced, power is supplied to the` position, so that assoon car motors and the car may start, in spite the fact that the brakeshaveibeen applied The principalY object of my invention is to overcomethe above difficulty by providingimproved means Vfor preventing'thesupply of current to the car motors unless the brake valve is in releaseposition and the controller is in off position.A

In the accompanying drawing; AF ig. vi is a view, partly in section,y ofa car control equipment with my invention applied thereto; and Fig. 2 asectional view of the brake valve device in aposition other than releaseposition. l

The construction shown in the drawing having an operating handle2, abrake valve device 3, having a valve chamber l containinga rotary valve5 7, havinga piston chamber 8 containing` a piston 9.

The stein 10 of piston 9 carries connected contacts 11 adapted to bridgefixed contacts 12 for closing the power circuit from the trolley 13 tothe controller 1. A spring 14 acts on one side of piston 9 and tends toshift the piston in a direction for opening the power circuit and thepiston chamber 8 at the opposite side is connected to a pipe 15, leadingto the seat of the rotary valve 5,

Operatively 'connected to the controller shaft 16 of the pOWer.COlltroller is a rc:

i Specification of Letterslarent.

car to a stop. sor

'throughcavitylS in valve l;

The piston-9 is thenshifted toits outer v position, closing the powercircuit through adapted to -be operatedy by handle 6, and a pneumaticswitch device tary kvalve 417 havingfa cavity nect an additionalpipef19, leadin'gfromupiston chamber, to the pipefl;

The pipe 15 opens intopiston chainberf at. the centralportion and thepiston `9A is provided with a central 4,seating ring 2o which isadapted,when the piston is iii its lowermo'st'; position, to iseal only on thepiston.

In the release position of the brakevalve device v3, a port 21 in therotary valve registers witi the pipe and passage lfanr in otherpositions of the brake rvalve,jas shown in Fig. 2ofthedrawing.,afc-avity 22 connects the .pipe 15 with an exhaust port23.

. 18,:adflpf'fiintheoiposition of the controller to con-v y oiiqthjepipe 15,1- so thaty ai'iyvpressure infpipe 15 then acts,`

vrestricted 4'seated .area oi t'he65 In operation, with the brake valvein ree.-

lease position and the controller handle2 fromthe brake valve throughport ber Sfboth through thedirect 7 and pipe 19.

the switchcontacts 11 and 112, as showninl Fic. 1.y y

o 'long as the brake valve 3 remains in 'releasepositioin the piston.9will be maintained the. controller 1 may usual manner, to supplycurrent to the car motors for propelling the car.

If the brake valve is moved from release 4position `to apply the brakes,the lpipe 15 is: connected through cavity `22 with eX haust port-23, sois vented :from pistonr chamber 8 and piston 9 is then operated by thespring 14l--toope'n the switch contacts.

It will now be seen that if the trolley wheel should leave the wire andthe operator should apply the brakes to stop the car, the power circuitto the controller will be opened, so that even if he leaves the car toreplace the trolley with the controller in a power-on position, currentwill not be supplied to the car motors when the trolley wheel isreplaced. i

When he returns to the car, if he should return the brake valve torelease position,

in the lcircuit c losing position, vand be4 operated `in the,

that fluidV under pressure,

in oli' position, Huid under pressure isy sup-r` kplied 21 to pipe 15and flows rto the piston cliain- A vf;

connection and t leaving the controller in a power-on posi tion, the carwould not start, since the pipe 19 is closed in the power positions ofthe controller and fluid under pressure supplied to the area of iston 9enclosed by the seating ring 2O wil not be sufficient to lift thepiston.

In order to start, the operator must move the controller to off positionas well as the brake valve to release position, so that fluid underpressure can be supplied through cavity 18 and pipe 19 to substantiallythe full area of piston 9. Fluid supplied to piston chamber S throughpipe 19 then operates to shift piston 9 to its upper position forclosing the power circuit.

Thereafter, the controller may be operated through its power positions,since the piston 9 can now be held in its upper position by fluidsupplied to piston chamber 8 directly through pipe 15, so long as thebrake valve remains in release position.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. The combination with a controller and a brake valve, of a fluidpressure roperated switch device for controlling the power circuit tothe controller and means controlled by said controller for controlling acommunication through which fluid under pressure is supplied from thebrake valve to said switch device.

2. The combination with a controller and a brake valve, of a fluidpressure operated switch device Jfor controlling the power circuit tothe controller and a valve operated by said controller and adapted inthe off position of the controller to establish com'- inunication forsupplying fluid under pressure from the brake valve to said switchdevice.

3. The combination with a controller and a brake valve, oli a fluidpressure operated switch device for controlling the power circuit tothecontroller and adapted to be supplied with fluid under pressure 'fromthe brake valve through one communication and a valve operated uponmovement of the controller for opening another communication from thebrake valve to said switch device.

Il. The combination with a controller of a fluid pressure operatedswitch device for controlling the power circuit to 'the controller andnormally subject to fluid under pressure 'for holding the power circuitclosed and a brake valve having a brake applying position and ports forventing fluid 'from sai switch device to thereby permit the operation ofsame to eiiect the opening of the power circuit.

In a brake and power control apparatus, the combination with acontroller, of a switch for controllingthe power circuit to saidcontroller, a piston 'for operating same and having two areas separatedin the seated position of the piston by a seat, a brake valve `forsupplying fluid under pressure to one area, and means controlled by thecontroller for supplying fluid under pressure to the other area.

6. ln a brake and tus, the combination power control apparawith acontroller, of a fluid pressure operated switch for controlling thepower circuit to said controller, a brake valve for supplying fluidunder pressure to said switch device Yin release position. and meansoperative in the off position of the controller for also supplying`fluid under pressure to said switch device.

7. ln a brake and power control apparatus, the combination with acontroller, of a fluid pressure operated switch for controlling thepower circuit to said controller, :i brake valve for supplying fluidunder pressure to said switch device 1n release position ,and forventingA fluid under pressure ifromsaid switch device in the brakeapplied positions of the brake valve, and a valve operated by saidcontroller for supplying fluid under pressure to said switch device onlyin the off position ofthe controller.

8. The combination with a controller, of a switch device operated byfluid under pressure for controlling the power circuit to saidcontroller, a brake valve adapted only 4 in release position to supplyfluid under pressure to said switch device, and a valve operated by saidcontroller in off position only for opening communication through whichfluid is supplied from the brake valve to said switch device.

ln testimony whereof l have hereunto set my hand.

CLYDE C. FARMER.

